Pigeons at the Norwich Market and City Hall area. The contraceptive policy was proposed at a City Hall meeting on Tuesday night at which the pigeon issue was discussed. A man wore a pigeon mask during the meeting at Norwich City Hall (Image: Owen Sennitt)Labour councillors argued the measures is necessary to prevent the war memorial from damage caused by pigeon guano. Pigeons at the Norwich Market and City Hall area. Pigeons at the Norwich Market and City Hall area.